CN211377724U

CN211377724U - Inner rotor motor permanent magnet fixing structure

Info

Publication number: CN211377724U
Application number: CN202020341700.8U
Authority: CN
Inventors: 杨良才; 梁昌勇; 李红文; 江振河
Original assignee: Hepu Power Co ltd
Current assignee: Hepu Power Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-08-28
Anticipated expiration: 2030-03-18

Abstract

The utility model provides an inner rotor motor permanent magnet fixed knot constructs, which comprises a rotating shaft, the setting is at the epaxial rotor yoke of commentaries on classics, the permanent magnet of setting on the rotor yoke, its characterized in that is provided with the heavy groove more than the round along rotor yoke surface, heavy inslot is fixed with the convex aluminium clamp plate of end to end more than two, the convex aluminium clamp plate of end to end more than two in the heavy inslot forms the circular aluminium clamp plate of round, circular aluminium clamp plate surface evenly is provided with the several forked tail and inlays the groove, the tank bottom that the groove was inlayed to the forked tail is not higher than rotor yoke surface, the permanent magnet that is the forked tail form is inlaye. Compared with the application technology, the utility model, have the problem that reduces interelectrode flange magnetic field magnetic leakage, improves motor work efficiency, solves the rotor and adopts cast iron structure permanent magnet installation, reduce motor manufacturing cost's advantage.

Description

Inner rotor motor permanent magnet fixing structure

Technical Field

The utility model relates to a motor technology.

Background

In the motor industry, an inner rotor motor is more and more widely applied to various industrial fields because of stable performance, higher efficiency and power factor and constant rotating speed, and particularly, the inner rotor permanent magnet synchronous motor has a simpler structure in a synchronous motor, so that the inner rotor permanent magnet synchronous motor is widely applied by motor manufacturers. According to the principle of the inner rotor permanent magnet synchronous motor, the following steps are available: the rotor drives the permanent magnet to rotate, centrifugal force is generated, the permanent magnet is far away from the rotor, electromagnetic force generated by interaction of electromagnetic fields of the stator winding and the permanent magnet also enables the permanent magnet to be far away from the rotor, the permanent magnet can generate thrust in the circumferential tangential direction in the electromagnetic fields, and in order to reduce vibration and torque pulsation of the motor, the permanent magnet must be uniformly distributed on the outer surface of a rotor iron core in a circumferential mode. Therefore, how to reliably realize the radial and circumferential tangential fixation of the permanent magnets and uniformly assemble the permanent magnets on the rotor core is a key technology for designing the inner rotor type permanent magnet synchronous motor.

At present, as shown in fig. 5, a conventional external-embedded permanent magnet fixing method technology is adopted, a rotor core 11 of the technology is formed by laminating punching sheets, notches matched with permanent magnets 13 in shape are punched on the punching sheets, the permanent magnets 13 are axially inserted into the notches of the rotor core 11, so that a part of the permanent magnets are positioned outside an outer circle of a rotor, a part of the permanent magnets are positioned inside the outer circle of the rotor, inclined planes on two sides of the notches realize radial fixing of the permanent magnets, an inter-pole flange 11a realizes circumferential tangential fixing, and a pressing plate 12 realizes axial compression fixing of the permanent magnets. The scheme has the defects that because the interpolar flanges 11a on the rotor core are made of magnetic conductive materials, the magnetic leakage at the position is serious, the magnetic field leakage is serious, the working efficiency of the motor is low, and the consumption of silicon steel sheet materials of the structure is large. In particular, the height of the inter-pole flange is difficult to design, the magnetic flux leakage is more serious, the consumption of permanent magnet materials is larger, and the manufacturing cost of the motor is high.

Disclosure of Invention

The utility model aims at providing a reduce interelectrode flange magnetic field magnetic leakage, improve motor work efficiency, solve the problem that the rotor adopted cast iron structure permanent magnet installation, reduce motor manufacturing cost's inner rotor motor permanent magnet fixed knot constructs.

The utility model discloses a realize like this: including the pivot, the setting is at the epaxial rotor yoke of commentaries on classics, the permanent magnet of setting on the rotor yoke, its special character lies in being provided with the heavy groove more than the round along rotor yoke surface, heavy inslot is fixed with the convex aluminium clamp plate of end to end more than two, the convex aluminium clamp plate of end to end more than two in the heavy groove forms the circular aluminium clamp plate of round, circular aluminium clamp plate surface evenly is provided with the several forked tail and inlays the groove, the tank bottom that the groove was inlayed to the forked tail is not higher than rotor yoke surface, the permanent magnet that is the forked tail form is inlayed at the forked tail and is inlayed.

Because the aluminum alloy material has extremely low magnetic permeability, the interelectrode flange can effectively reduce the magnetic flux leakage problem of a magnetic field. The rotor magnetic yoke is made of cast iron material instead of conventional silicon steel sheet material, and the reinforcing ribs are arranged inside the rotor magnetic yoke, so that the material consumption and the material cost are reduced.

Advantageous effects

1. The problem that the rotor core adopts a cast iron structure and the permanent magnet is installed and fixed can be solved;

2. the aluminum alloy material is adopted as the interpolar flange to fix the permanent magnet, so that the magnetic leakage of a magnetic field is reduced, and the working efficiency of the motor is improved;

3. the manufacturing cost of the motor is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a three-dimensional exploded view of the inner rotor of the present invention;

fig. 4 is a schematic view of the installation of the inner rotor permanent magnet of the present invention;

fig. 5 is a technical schematic diagram of a conventional external-embedded permanent magnet fixing mode.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings and examples:

as shown in the figures, the rotor b in the stator a of the present invention is realized by including a rotating shaft 1, a rotor yoke 2 fixed on the rotating shaft 1, and a permanent magnet 3 arranged on the rotor yoke 2, and is characterized in that more than one circle of sinking groove 4 (2 circles in the embodiment) is arranged along the outer surface of the rotor yoke 2, more than two arc-shaped aluminum pressing plates 5 (5 arc-shaped aluminum pressing plates 5 in the embodiment) are fixed in the sinking groove 4, more than two arc-shaped aluminum pressing plates 5 in the sinking groove 4 form a circle of circular aluminum pressing plate c, the outer surface of the circular aluminum pressing plate c is uniformly provided with a plurality of dovetail embedding grooves 6 (20 dovetail embedding grooves 6 in the embodiment, 3 in the middle of each arc-shaped aluminum pressing plate 5, half of both ends of each arc-shaped aluminum pressing plate 5, and half of the dovetail embedding grooves 6 between adjacent arc-shaped aluminum pressing plates 5 form one dovetail embedding groove 6), an interelectrode flange 6a is arranged between every two adjacent dovetail embedding grooves 6, the groove bottom 6b of each dovetail embedding groove 6 is not higher than the outer surface of the rotor magnetic yoke 2, and the dovetail-shaped permanent magnets 3 (composed of three permanent magnet blocks connected end to end) are embedded in the dovetail embedding grooves 6.

One end of the rotor magnetic yoke 2 is provided with a stop flange 7, and the permanent magnet 3 is fixed between the stop flange 7 and the end pressing plate 9 by the end pressing plate 9 fixed at the other end of the rotor magnetic yoke 2 through an end pressing plate screw 8.

The circular arc-shaped aluminum pressing plate 5 is fixed in the sinking groove 4 through a screw 10.

During assembly, firstly, the arc-shaped aluminum pressing plate 5 is installed, the screws 10 are not locked firstly, after the permanent magnets 3 are inserted, the screws 10 are locked, the circumferential positions of the permanent magnets 3 are uniformly distributed and fixed, but gaps moving axially exist, the rest permanent magnets 3 are inserted, and finally, the end pressing plate 9 is installed, and the permanent magnets 3 are limited on the surface of the rotor magnetic yoke 2. The end pressing plate 9 is in an annular integral structure, the end part is provided with a seam allowance installed on the rotor magnetic yoke 2, and the seam allowance after the end pressing plate 9 is installed is not higher than the outer circular arc of the permanent magnet 3, so that the positioning effect is realized.

Claims

1. The utility model provides an inner rotor motor permanent magnet fixed knot constructs, which comprises a rotating shaft, the setting is at the epaxial rotor yoke of commentaries on classics, the permanent magnet of setting on the rotor yoke, its characterized in that is provided with the heavy groove more than the round along rotor yoke surface, heavy inslot is fixed with the convex aluminium clamp plate of end to end more than two, the convex aluminium clamp plate of end to end more than two in the heavy inslot forms the circular aluminium clamp plate of round, circular aluminium clamp plate surface evenly is provided with the several forked tail and inlays the groove, the tank bottom that the groove was inlayed to the forked tail is not higher than rotor yoke surface, the permanent magnet that is the forked tail form is inlaye.

2. The inner rotor motor permanent magnet fixing structure of claim 1, wherein the number of the circular arc aluminum pressing plates constituting the circular aluminum pressing plate is 5, 20 dovetail mounting grooves are uniformly formed in the outer surface of the circular aluminum pressing plate, the number of the middle portions of each circular arc aluminum pressing plate is 3, half of each circular arc aluminum pressing plate is provided at both ends thereof, and a dovetail mounting groove is formed by half of the dovetail mounting grooves between adjacent circular arc aluminum pressing plates.